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If the only income you received was from SS then there most likdely will not be tax due on it:
Here is an excerpt from the IRS FAQ about survivor benefits:
Are social security survivor benefits for children considered taxable income?
The person who has the legal right to receive the benefits must determine whether the benefits are taxable. For example, if you and your child receive benefits, but the check for your child is made out in your name, you must use only your part of the benefits to see whether any benefits are taxable to you. The amount of income tax that your child must pay on that part of the benefits that belong to your child depends on the total amount of income and benefits for the taxable year. Refer to Publication 915 and Tax Topic 423, Social Security and Equivalent Railroad Retirement Benefits.
Here is a link to IRS Publication 915 that has worksheets to help you determine if and how much is taxable.
I find it curious that you did not recieve an SSA-1099. I would call the IRS 1(800)(NNN) NNN-NNNNand Social Security http://www.ssa.gov/reach.htm to try and find out why you did not get one.
I hope this helps.
If you have any further questions let me know.